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I did a trial run on migrating a 2015 TFS projection collection to 2020 DevOps. It went successfully but now I have to redo the migration since some time has past and the developers have updated the 2015 TFS project collection. I redid my steps on detaching the 2015 TFS project collection and backing up the database and moving it over to the other SQL Server and restored it. I tried to attach the project and now the project collection does not appear in the Attachment list in 2020 DevOps. Is there a TFS tool command i need to do?

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nevermind. i backed up the sql server database first before i detached the project collection. I needed to detach and then back up the sql server. It works now.